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| 型号： | A4973SLBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC PWM MOTOR DVR FULL 16SOIC |
| 特色产品： | A4973 Motor Driver |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 5 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | 620-1438-6 |
A4973
The current-sensing comparator functions down to ground
allowing the device to be used in microstepping, sinusoidal, and
other varying current-profile applications.
Full-Bridge PWM Motor Driver
switching losses in the device and iron losses in the motor. This
also improves the maximum rate at which the load current can
increase (as compared to fast decay) due to the slow rate of decay
during t OFF . When the load current is decreasing, fast-decay mode
recommended that the maximum junction temperature be kept
best by attaching a thermocouple to the power tab/batwing of the
Thermal Considerations. For reliable operation it is
is used to regulate the load current to the desired level. This
below 110°C to 125°C. The junction temperature can be measured prevents tailing of the current profile caused by the back-EMF
voltage of the stepper motor.
T J ≈ T TAB + I LOAD × R DS(on) x R θ JT
device and measuring the tab temperature,T TAB .The junction
temperature can then be approximated by using the formula:
2
The value for R θ JT is given in the package thermal resistance table
for the appropriate package.
The power dissipation of the batwing packages can be improved
by 20% to 30% by adding a section of printed circuit board
copper (typically 6 to 18 square centimeters) connected to the
batwing terminals of the device.
PCB Layout. The load supply terminal, V BB , should
be decoupled with an electrolytic capacitor (>47 μ F is
recommended) placed as close to the device as is physically
practical. To minimize the effect of system ground I x R drops on
the logic and reference input signals, the system ground should
have a low-resistance return to the motor supply voltage. See also
the Current Sensing and Thermal Considerations sections, above.
Fixed Off-Time Selection. With increasing values of t OFF,
switching losses will decrease, low-level load-current regulation
will improve, EMI will be reduced, the PWM frequency will
decrease, and ripple current will increase. The value of t OFF can
be chosen for optimization of these parameters. For applications
where audible noise is a concern, typical values of t OFF are chosen
to be in the range of 15 to 35 μ s.
Stepper Motor Applications. The MODE terminal can be
used to optimize the performance of the device in microstepping/
sinusoidal stepper-motor drive applications. When the load
current is increasing, slow decay mode is used to limit the
In stepper-motor applications applying a constant current to
the load, slow-decay mode PWM is typically used to limit the
switching losses in the device and iron losses in the motor.
DC Motor Applications . In closed-loop systems, the
speed of a dc motor can be controlled by PWM of the PHASE
or ENABLE inputs, or by varying the reference input voltage
(REF). In digital systems (microprocessor controlled), PWM of
the PHASE or ENABLE input is used typically thus avoiding
the need to generate a variable analog voltage reference. In this
case, a dc voltage on the REF input is used typically to limit the
maximum load current.
In dc servo applications, which require accurate positioning
at low or zero speed, PWM of the PHASE input is selected
typically. This simplifies the servo control loop because the
transfer function between the duty cycle on the PHASE input and
the average voltage applied to the motor is more linear than in the
case of ENABLE PWM control (which produces a discontinuous
current at low current levels).
With bidirectional dc servo motors, the PHASE terminal can be
used for mechanical direction control. Similar to when braking
the motor dynamically, abrupt changes in the direction of a
rotating motor produces a current generated by the back-EMF.
The current generated will depend on the mode of operation. If
the internal current control circuitry is not being used, then the
maximum load current generated can be approximated by I LOAD =
(V BEMF + V BB )/R LOAD where V BEMF is proportional to the motor ’s
speed. If the internal slow current-decay control circuitry is used,
then the maximum load current generated can be approximated
by I LOAD = V BEMF /R LOAD . For both cases care must be taken to
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A4975 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Full-Bridge PWM Microstepping Motor Driver |
| A4975SB-T | 功能描述:IC PWM MICROSTEP DVR FULL 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A4975SLBTR-T | 功能描述:IC PWM MICROSTEP DVR FULL 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| A4979 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4979 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4979GLPTR-T | 功能描述:IC MOTOR DRVR MICRO STEP 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
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